IEEE 802.11-24 Roaming Proposal
Explore a proposal for roaming with non-AP STA availability check in IEEE 802.11-24, addressing dynamic signal quality changes between non-AP STA and AP, and the necessity of an availability check method for successful communication in roaming scenarios.
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July 2024 doc.: IEEE 802.11-24/1310r0 11bn Roaming with Non-AP STA Availability Check Date: 2024-07-15 Authors: Submission Slide 1 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 Abstract Roaming is an important feature of 802.11bn in Multi- BSSs environment. Since communication signal quality between non-AP STA and AP can be changed dynamically, it is difficult to estimate when non-AP STA is available in roaming target AP. Therefore, non-AP STA s availability check method with roaming target AP is necessary. In this submission, availability check based roaming is proposed. Submission Slide 2 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 Roaming with Non-AP STA availability check To address the issue, an availability check method for 11bn can be considered Between the original AP and the non-AP STA, the target AP s link is enabled. After link enable and link switching, the target AP can perform availability check for the non-AP STA The availability check can be performed within specific timeout After the availability check, the non-AP STA can: communicate with the target AP if the availability check succeeds. return to and communicate with the original AP if the availability check fails. Submission Slide 3 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 Recap: 11bn Roaming from past discussions In some submissions [1] [2], variety of roaming methods for 11bn was proposed. E.g., A non-AP STA roams from AP 1(Old AP) to AP 2(New, Target AP). AP 2 s link can be enabled by the non-AP STA from AP 1. Because the non-AP STA enabled AP 2 s link from AP 1, communication may not be available between the non-AP STA and AP 2. Submission Slide 4 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 Non-AP STA availability check in target AP (Success) Candidate target APs (e.g., AP 2) can solicit non-AP STA s response at the roaming expected time. A frame soliciting non-AP STA s response may be a Trigger frame, RTS frame, etc., Target AP which receives a response from the non-AP STA can commence communication with the non-AP STA. Submission Slide 5 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 STA availability check in target AP (Failure) Roaming procedure with the target AP can fail due to unexpected signal quality change. The non-AP STA cannot receive from the the target AP a frame which soliciting non-AP STA s response. STA can resume communication with the old AP(e.g., AP 1) by transmitting comeback frame. Submission Slide 6 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 Summary In this submission, STA availability check based roaming is proposed. Since communication signal quality between STA and AP can be changed unexpectedly, it is difficult to estimate when STA is available in roaming target AP. In order to provide reliable roaming performance, STA s availability based roaming method is necessary. Submission Slide 7 Ronny Yongho Kim, KNUT
July 2024 doc.: IEEE 802.11-24/1310r0 References [1] 24/0052r0, Seamless Roaming Details , https://mentor.ieee.org/802.11/dcn/24/11-24-0052-00- 00bn-seamless-roaming-details.pptx [2] 24/0412r1, Seamless Roaming Procedure Follow- Up , https://mentor.ieee.org/802.11/dcn/24/11-24-0412- 01-00bn-seamless-roaming-procedure-follow-up.pptx Submission Slide 8 Ronny Yongho Kim, KNUT
